Volume 34 Issue 8
Aug.  2019
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Article Navigation >  Journal of Aerospace Power  > 2019  >  34(8): 1633-1643
Numerical study on heat transfer mechanism of brush seal based on three-dimensional solid modeling[J]. Journal of Aerospace Power, 2019, 34(8): 1633-1643. doi: 10.13224/j.cnki.jasp.2019.08.001
Citation: Numerical study on heat transfer mechanism of brush seal based on three-dimensional solid modeling[J]. Journal of Aerospace Power, 2019, 34(8): 1633-1643. doi: 10.13224/j.cnki.jasp.2019.08.001
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Numerical study on heat transfer mechanism of brush seal based on three-dimensional solid modeling

doi: 10.13224/j.cnki.jasp.2019.08.001
  • Received Date: 2018-09-20
  • Publish Date: 2019-08-28
    Abstract
  • A model for solving the heat transfer characteristics of brush seals based on three-dimensional solid modeling was established. The distribution characteristics of the flow field and temperature field of the brush seal were analyzed by verifying the accuracy of the numerical model. The influences of the pressure ratio, the rotational speed and the interference on the maximum temperature of the brush wire were studied. The heat transfer mechanism of the brush seal was revealed. The results showed that the end-discharge brush wire and the rotor face were mainly concentrated in the high temperature area of the bristle. The maximum temperature of the brush wire increased with the increase of the pressure ratio, rotational speed and interference, in which the interference had obvious influence on the maximum temperature. When the amount of interference increased from 0.1 mm to 0.7 mm, the maximum temperature increased 1.61 times; The main source of heat of the brush seal was generated by friction between the brush and the rotor surface, the heat transfer form of the brush seal included conduction heat and convection heat exchange. The friction heat flow entered the brush wire bundle and the rotating shaft through the heat conduction form. When the contact force between the brush wire and the rotor increased, the frictional heat flux increased, and the maximum temperature rose. The friction heat flowed through the heat transfer between fluid and solid transmission, and the main form of heat dissipation was the leakage of air taking away part of the heat.

     

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